Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

Prove that the below maths equation is true.

8 + 8 = 91

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What does below chemistry rebus means?

Can you replace the question mark with the correct number?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

What does the below rebus riddle means?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

A woman shoots her husband.

Then she holds him under water for over 5 minutes.

Finally, she hangs him.

But 5 minutes later they both go out together and enjoy a wonderful dinner together.

How can this be?